Engine-crank casing.



E. R. HEWLTT.

ENGINE CRANK CASING.

APPLICATION men Die. 30, 1910;

Patented Apr. 13, 1915.

3 SHEETS-11331 1.

E. R. HEWITT.

ENGINE CRANK CASING.

APPLICATION FILED DEC. 30. 1910.

% Patented Apr. 13, 1915.

3 SHEETS-SHEET 2.

E. R. HEWITT.

ENGINE CRANK CASING.

APPLICATION FILED 05c. 30. 1910.

Patented. Apr. 13, 1915.

3 SHEETS-SHEET 3.

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ENU'TNE-CRANK CASTNQ.

Application filed December 30, 1910. aerial No To all whom it may concern: Be it known that T, Enwann R. Hnwr a citizen of the United States, resident of lltingwood, in the county of Passaic, State of New Jersey, have invented certain new and useful lmprovements in Engine-Crank Casings, of which the following 1s a specification, reference being bad to the accompanying drawings, forminga part hereof.

My invention in particular relates to engine construction and has for its object primarily to simplify the construction thereof so as to facilitate assembling, inspection and repair.

Wlfhile applicable in other cases, my invention is particularly suitable in the case of engines for automobiles, and in the particular form hereinafter shown and described it is embodied in an autpmobile engine; The construction permits the engine and its associated parts to be permanently supported b a ,main housing while the inclosed cra case may be opened by the removal, in amost simple and rapid manner, of aolower section, adording access to all of the internal moving parts in the crank chamber without disassembling or changing the ad-- justment of any such parts.

. In the accompanying drawings-l igure l is a side elevation of an engine embodying the present invention, partly in section.

\ Fig. 2 is a section on the line K-- of Fig.

1, showing the lower crank case assembled. l ig; 3 is a view similar to Fig. 2 with the lower crank ease removed.

A, A represent the cylinders, B the upper or main section of the crank case, G the lower or detachable crank case section, l) the crank shaft, E the fly-wheel and 1E, F the clamping straps. p

The cylinders A, A, are secured to the upper crank case section'lB, by bolts 1, l, in the usual manner. The crank shaft bearings 2, 2 are integral with the upper crank case B and are formed in the lower edges of the laterally extending webs 3, 3, which serve as supports for the bearings and as stidening members for said crank case. Through tubular columns A, A, intc al with the crankcase 1B and extending from the projections of the bearings 2, 2, on either side of the webs 3, 3, to the upper face of said crank shaft, pass bolts 5, 5, by which the crank shaft bearing caps 6, b, are aeepeclfication'ot Letters Patent.

Patented Apr. f3, rare.

and i curedto the crank shaft bearings; Bearings, other than those for the crank shaft, are formed in the webs 3, 3, in any suitable manner, such as, the cam shaftbearings 7, 7, I

supporting the cam shaft 8.

Around the lower edge of the upper crank case B is a recess or groove 9 in the casing, adapted to receive a packing strip 10 of felt,

tilt

rubber or other, suitable material, the purpose of which will be hereinafter set forth.

Extending from either side of the crank case B, preferably at points opposite the crank shaft bearings. 2, 2, are housings l1,

11, terminating at their outer and lower extremities in lugs 12, 12, which serve as supporting members for the engine and which may be secured to any suitable framing by bolts passing through the holes 13, 13.

The lower crank case section G is designed to admit of the movement of any rotatin engine parts below the upper crank case and is so formed at itsupper edge as to register with the groove 9 1n the lower ed e of the upper crank case B; exce t at tfie points where the crank shaft passes through the engine housing. At the last named points the case is formed to receive the shaft 31) and has grooves in its ed e surrounding the shaft or its bearings or the reception of felt washers, or washers of other suitable material, to prevent the leakage of oil from the crank case.

- The lower crankcase C, has cast integral with it, the laterally extending stifl'ening members or webs M, M, dividing the said case into a plurality of sections. These webs are provided with holes l5, 15, for the passage o oil from one section to the other. I The housings l1, l1, extendin from the upper crank casing B are adapte to receive the hollow pins 16, from which are pivotally swung the clamping straps F, F. The straps 1F, 18?, depend downwardly from their supporting pins l6, 16, are bent to conform to the lateral and lower outer surface of lower crank case C, are angled at their lower extremities l7, 17, to form lugs, and are provided with stid'ening members 18, 18, through which and the said angled portions 17 17 pass the singleclamping bolts 19,19.

The lugs 17, 17, of the straps l3, l3, do not meet in their clam ed position, but are spaced apart to al ow for the draw a action of the bolts l9, l9.

too

' 1 her for said mechanism.

From the above descriptiomthe-method of assembling or dismembering the lower crank case section C and. theupper crank case section B is readily seen to be as follows: In assembling, the upper peripheral edge of the crank case C is registered against the packing strip 10 in the groove 9 of the u per crank case B and the clamping straps F, are brought under the lower case C and their free ends attached and drawn tightly together by the clamping bolts 19, 19, to force the upper edge of the crank case G into the yielding packing 10 of the crank case B, thus forming an air proof and dust -proofinclosure for the engineand its-associated parts. The-webs 14, 14, in the crank case G act as compression members against the clamping I straps F, F, and serve to,

equalize the pressure of said case against the packing 10 in the crank case B. By the 'unclamping of the bolts 19, 19, and the swinging-outwardly of the clamping straps F, F, the lower "crank case C may be immediately detached from the upper crank case B, leaving all the operating mechanism, inclosed by the crank case, opento inspection.

It will be understood, fromthe structure shown, that the lower crank case 0 does not support any of the moving mechanism of the engine and serves only as an inclosing mem- It will now be seen that in the practice of my invention an engine can be completely assembled and adjusted, particularly as to its crank shaft, piston rods, timing gears and any other operating parts after mounting on the chassis. The parts are supported in operative position fullyadjusted and the bearings remain accessible for any purpose desired. Thereupon the lower or sub-casing is brought into position and the clamping straps are swung into contact with the lower casing, and clamped securely by a single bolt only be inthe vicinity of the bolt. By my construction I obtain a tighter joint than it is possible to secure by means of a plain sur- -dozen or more bolts.

face and gasketor other means now usual in englneconstruction.

In engine construction, articularly auto- 'mobile engines, as hereto ore supported, it

has been usual to attach the lower and upper sections of engines by bolting together their machined flanges, necessitating as many as a In the present construction, however, the whole bottom of the engine can be left rough, except the bearing surfaces, and the upper edge of the lower crank case need not be machined, as proper contact with the felt groove w1ll make a tight'joint, the. result bein a very material saying in the cost of manu acture. Furthernidre, it has been usual to have the main bearings and other parts so arranged that upon the separation of the crank case sec- "tions the bearlngs were removed or separated, the gears or other parts disengaged 'and'inother. respects the adjustment of all operating parts changed, so that reassembly of thecrank case became a matter of difiiculty and required much time and care to actually accomplish.

. Q "While I have herein shown and described one particular embodiment of my invention, it Wlll be evident that the same is capable of modification-in many details and arrange" ment of construction, but What I claim and desire to secure by Letters Patent is:

1. In combination in an engine crank casing, anu'pper or main section having means for'supporting the entire engine, a removable" sub-section,- and straps supported by the main sectionand embracing the sub-section 'wherebythe' sub-section'ma'y be drawn into contact with the 'main section uniformly throughoutthe len oftheir contacting edges and the wei'g t of the sub section is supported by the-straps.

2. In combination in'an engine crank casing, an upper 'or main section having means for supporting the entire engine, a removable sub-section having its upper edges adapted to fit the loweri'ed ges 'ofthe upper section and having webs formed in it, and

straps supported" by'the upper section and each embracing the sub-section under a web whereby the clamping strain is distributed to'b'ring the sub-section edges in uniform contactwith the edges of the upper section. This specification signed and witnessed this 29 day of December, A. D. 1910.

j EDWARD R. HEWITT. Witnesses: j H. 'Mucrnuonn,

HERMAN F. CUN'rz.

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